VCP without ST LINK (STM32F303)

[le-gal.guillaume]

Hello,

It's my first question i'm new to STM32.

I use Win 11 and a Nucleo F303ZE (and a Nucleo F303RE, same problem), and y i need to use the virtual com port on the STM32 F303.

So, I try to enable the Virtual com port on the Nucleo F303ZE on th 2nd USB port (CN13) which is connect to PA11 and PA12.

the USB_DEVICE config on STM32Cube IDE:

The USB setting:

Normally, it's ok. But, if i plug a (tested) USB cable on CN13 (which is plug to PA11 & PA12), or not, nothing happend on window. I see a Virtual Port COm, but it's the ST LINK. I do something wrong?

I see the video :https://www.youtube.com/watch?v=h9T0RTu9Muc&list=PLnMKNibPkDnFFRBVD206EfnnHhQZI4Hxa&index=11

But it doesn't help me.

Thanks in advance,

Guillaume

[RhSilicon]

I tried to see the schematic of the board to try to understand how it works, but unfortunately the ST is going against the grain.

[le-gal.guillaume]

Hello,

here is the schema:

BR

 

[RhSilicon]

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@le-gal.guillaume wrote:

Hello,

here is the schema:

BR

 

---

Thanks, I opened a question about the schematic, now the schematics are available in the CAD Resources tab.

[le-gal.guillaume]

Another weird information...

I plug the AZ delivery logic analyzer (8 channels, 24MHz..)

When i plug the GND of the logic analyzer on the GND of the nucleo  and the channel 1 (it works only with channel1) on PA11 or PA12, Win 11 see the device:

It's maybe a step forward, but that adds some black magic..

BR

[RhSilicon]

I don't know if it can help in your case, but I found these videos about advanced debugging:

https://youtube.com/playlist?list=PLnMKNibPkDnEDEsV7IBXNvg7oNn3MfRd6

[le-gal.guillaume]

Hello,

No unfortunately it doesn't help me.

By the way, is it normal that USB_DP is at 0 after MX_GPIO_Init()?

The piece of code in MX_GPIO_Init() where  USB_DP switch to 0:

BR

 

[le-gal.guillaume]

I found:

Set PG6 (USB_PowerSwitchON) to High (Low by default) and it works:

This part of the scematic gived me the clue:

BR